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MC145745FW データシート(PDF) 4 Page - Motorola, Inc

部品番号 MC145745FW
部品情報  V.21/V.23 TELEMETER MODEM
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メーカー  MOTOROLA [Motorola, Inc]
ホームページ  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC145745FW データシート(HTML) 4 Page - Motorola, Inc

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MC145745
MOTOROLA
4
PIN DESCRIPTIONS (continued)
Pin
Location
Description
Type
Symbol
25
TxA2
O
Transmit Buffer Output 2 (Inverting) — This pin is the inverting output of the line driver. When VCC =
5 V, + 7 dBm (typ), differential output voltage (VTxA1 – VTxA2), can be obtained with a load of 1.2 kΩ
between pins TxA1 and TxA2. In typical applications, the output level on the telephone line will be half
of the differential output (refer to Application Circuit).
26
TxA1
O
Transmit Buffer Output 1 (Non–Inverting) — This pin is the non–inverting output of the line driver.
Refer to TxA2.
27
RxA
I
Receive Signal Input — This pin is the analog signal input which has 500 k
Ω input resistance (typ).
ABSOLUTE MAXIMUM RATINGS
Rating
Symbol
Value
Unit
DC Supply Voltage
VCC
– 0.5 to + 7.0
V
DC Input Voltage
Vin
– 0.5 to VCC + 0.5
V
DC Output Voltage
Vout
– 0.5 to VCC + 0.5
V
DC Input Current
Iin
± 20
mA
DC Output Current
Iout
± 25
mA
Power Dissipation
PD
500
mW
Storage Temperature Range
Tstg
– 65 to + 150
°C
RECOMMENDED OPERATIONAL CONDITIONS
Parameter
Symbol
Min
Typ
Max
Unit
DC Supply Voltage
VCC
3.3
5.0
5.5
V
DC Input Voltage
Vin
0
VCC
V
DC Output Voltage
Vout
0
VCC
V
Crystal Oscillation Frequency
fosc
3.579545
MHz
External Input Frequency (ECLK)
7.15909
Operating Temperature Range
TA
– 30
25
+ 85
°C
DC ELECTRICAL CHARACTERISTICS (VCC = + 3.3 to + 5.5 V, TA = – 30 to + 85°C)
Characteristic
Symbol
Conditions
Min
Typ
Max
Unit
Input Voltage
(TxD, ECLK, RESET,
SCP R
SCPCLK
High Level
VIH
0.7 x VCC
V
(
SCP Rx, SCPCLK,
SCPEN)
Low Level
VIL
1.1
Output Voltage
(RxD CD CLKO
High Level
VOH
Vin = VIH or VIL, Iout = 20 µA
VCC – 0.1
VCC – 0.01
(RxD, CD, CLKO,
PB0–3, SCP Tx)
Low Level
VOL
Vin = VIH or VIL
Iout = 20 µA
Iout = 2 mA
0.01
0.1
0.4
Input Leakage Current
(TxD, ECLK, RESET, SCP Rx,
SCPCLK, SCPEN)
Iin
Vin = VCC or GND
± 1.0
± 10.0
µA
Quiescent Supply
Current
VCC = 5 V
ICC
FSK Mode, RTLA = 0
TxA1 and TxA2 open
7
mA
DTMF Receive Mode, no input
9
VCC = 3.6 V
ICC
FSK Mode, RTLA = 0
TxA1 and TxA2 open
6
DTMF Receive Mode, no input
8
Power–Down Supply Current
ICC
Power–Down Mode 1
500
µA
Power–Down Mode 2
1.0
µA
This device contains circuitry to protect the
inputs against damage due to high static
voltages or electric fields. However, it is advised
that normal precautions be taken to avoid ap-
plications of any voltage higher than maximum
rated voltages to this high impedance circuit. For
proper operation, it is recommended that Vin and
Vout be constrained to the range GND v (Vin or
Vout) v VCC.
Reliability of operation is enhanced if unused
logic inputs are tied to an appropriate logic volt-
age level (e.g., either GND or VCC).


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